Single-Layer Dual-/Tri-Band Inverted-F Antennas for Conformal Capsule Type of Applications

Bao, Zengdi; Guo, Yong‐Xin; Mittra, R.

doi:10.1109/tap.2017.2758161

Cited by 70 publications

(29 citation statements)

References 21 publications

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“…In order to minimize losses due to the surrounding tissue environments, antenna engineers typically simulate their designs in electromagnetic simulators which account for the impact of the dielectric properties of tissues. This allows them to fine-tune various design parameters (like shape, geometry, thickness of conductor) to achieve the highest possible efficiency given the limited form factor and simulated medium [12]. • Resonance: Aside from optimizing the radiation efficiency of micro-implant antennas, state-of-the-art designs also exploit resonance [25,45].…”

Section: Resonant Rectenna Designmentioning

confidence: 99%

“…Finally, we note that this programmable architecture was the result of many iterations in consultation with the relevant literature. Antenna design is an art and is known to require extensive iterations, especially for bio-tissues, and thus it remains an active area of research [12]. One of the interesting designs we explored consisted of a single loop, where one side of the loop wass connected to energy harvesting while the other was connected to a programmable load; ω Figure 6-Rectenna Circuit Schematic.…”

Section: Antenna Reprogrammabilitymentioning

confidence: 99%

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Self-reconfigurable micro-implants for cross-tissue wireless and batteryless connectivity

Abdelhamid

Chen

Cho

et al. 2020

Proceedings of the 26th Annual International Conference on Mobile Computing and Networking

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We present the design, implementation, and evaluation of μmedIC, a fully-integrated wireless and batteryless micro-implanted sensor. The sensor powers up by harvesting energy from RF signals and communicates at near-zero power via backscatter. In contrast to prior designs which cannot operate across various in-body environments, our sensor can self-reconfigure to adapt to different tissues and channel conditions. This adaptation is made possible by two key innovations: a reprogrammable antenna that can tune its energy harvesting resonance to surrounding tissues, and a backscatter rate adaptation protocol that closes the feedback loop by tracking circuitlevel sensor hints. We built our design on millimeter-sized integrated chips and flexible antenna substrates, and tested it in environments that span both in-vitro (fluids) and ex-vivo (tissues) conditions. Our evaluation demonstrates μmedIC's ability to tune its energy harvesting resonance by more than 200 MHz (i.e., adapt to different tissues) and to scale its bitrate by an order of magnitude up to 6Mbps, allowing it to support higher data rate applications (such as streaming low-res images) without sacrificing availability. This rate adaptation also allows μmedIC to scale its energy consumption by an order of magnitude down to 350 nanoWatts. These capabilities pave way for a new generation of networked micro-implants that can adapt to complex and time-varying in-body environments. CCS CONCEPTS • Hardware → Full-custom circuits; • Computer systems organization → Sensor networks; • Applied computing → Life and medical sciences;

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Section: Resonant Rectenna Designmentioning

confidence: 99%

Section: Antenna Reprogrammabilitymentioning

confidence: 99%

Self-reconfigurable micro-implants for cross-tissue wireless and batteryless connectivity

Abdelhamid

Chen

Cho

et al. 2020

Proceedings of the 26th Annual International Conference on Mobile Computing and Networking

View full text Add to dashboard Cite

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“…However, the fringing fields below Z 2 may couple to the components affecting the antenna impedance. A well-established approach to evaluate the effect of the inner components on the antenna impedance consists in introducing a perfect electric conductor (PEC) cylinder to the capsule model and vary its radius and/or position [13], [15], [21].…”

Section: Robustness To Inner Componentsmentioning

confidence: 99%

Immune-to-Detuning Wireless In-Body Platform for Versatile Biotelemetry Applications

Nikolayev

Sauleau

2019

IEEE Trans. Biomed. Circuits Syst.

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Background and Objective: In-body biotelemetry devices enable wireless monitoring of a wide range of physiological parameters. These devices rely on antennas to interface with external receivers, yet existing systems suffer from impedance detuning caused by the substantial differences in electromagnetic properties among various tissues. In this paper, we propose an immune-to-detuning in-body biotelemetry platform featuring a novel tissue-independent antenna design. Methods: Our approach uses a novel slot-patch conformal antenna integrated into a flexible polyimide PCB containing the device circuitry and encapsulated within a 17.7 mm × 8.9 mm biocompatible shell. The antenna is synthesized and optimized using a hybrid analytical-numerical approach, then characterized numerically and experimentally in terms of impedance stability. Results: The proposed platform shows stable impedance whereas operating in any mammalian tissue as well as in air. The system is optimized for the 434 MHz ISM band and can easily be returned for any MedRadio band in the 401-457 MHz spectrum. Conclusion: Ultra-robust impedance characteristics were achieved. Without any modifications, the proposed biotelemetry platform can be used, for instance, as an ingestible for humans or as an implantable for a wide range of animals: from rodents to cattle.Index Terms-biomedical telemetry, conformal antennas, implantable, in-body, ingestible, ISM (industrial, scientific, and medical) band, MedRadio band, robust antennas.

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“…Izdebski et al designed a meandered dipole antenna conforming to the interior surface of a capsule [29]. Bao et al developed a triband inverted-F antenna [30] with the gains G = - (30,25,23) dBi for 403 MHz, 915 MHz, and 2.45 GHz, respectively, when simulated inside the stomach of torso model Gustav (CST Microwave Studio [31]).…”

Section: Antenna Design Approachesmentioning

confidence: 99%

Modeling and Characterization of in-Body Antennas

Nikolayev

2018

2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)

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Emerging wireless in-body devices pave the way to many breakthroughs in healthcare and clinical research. This technology enables monitoring of physiological parameters while maintaining mobility and freedom of movement of its user. However, establishing reliable communication between an in-body device and external equipment is still a major challenge. The radiation efficiency is constrained by attenuation and reflection losses in tissues. Furthermore, the antennas suffer from impedance detuning issues caused by uncertain electromagnetic properties of body tissues. First, we show that choosing an optimal operating frequency depends on application scenarios and can reduce the losses. Specific designs are then discussed to mitigate the antenna detuning effects due to surrounding biological tissue. Modeling approaches are proposed to lessen the design and optimization complexity. Finally, we present an accurate characterization method of in-body antennas in canonical phantoms using analog fiber optic links.

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Single-Layer Dual-/Tri-Band Inverted-F Antennas for Conformal Capsule Type of Applications

Cited by 70 publications

References 21 publications

Self-reconfigurable micro-implants for cross-tissue wireless and batteryless connectivity

Self-reconfigurable micro-implants for cross-tissue wireless and batteryless connectivity

Immune-to-Detuning Wireless In-Body Platform for Versatile Biotelemetry Applications

Modeling and Characterization of in-Body Antennas

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